Cosmology with orthogonal nilpotent superfields

We study the application of a supersymmetric model with two constrained supermultiplets to inflationary cosmology. The first superfield S is a stabilizer chiral superfield satisfying a nilpotency condition of degree 2, S-2 = 0. The second superfield Phi is the inflaton chiral superfield, which can be combined into a real superfield B equivalent to 1/2i (Phi - (Phi) over bar. The real superfield B is orthogonal to S, SB = 0, and satisfies a nilpotency condition of degree 3, B-3 = 0. We show that these constraints remove from the spectrum the complex scalar sgoldstino, the real scalar inflaton partner (i.e. the sinflaton), and the fermionic inflatino. The corresponding supergravity model with de Sitter vacua describes a graviton, a massive gravitino, and one real scalar inflaton, with both the goldstino and inflatino being absent in unitary gauge. We also discuss relaxed superfield constraints where S-2 = 0 and S (Phi) over bar is chiral, which removes the sgoldstino and inflatino, but leaves the sinflaton in the spectrum. The cosmological model building in both of these inflatino-less models offers some advantages over existing constructions.